Wiper system

Abstract

A wiper system for wiping off deposits deposited on a surface of a wiped member comprising a pair of carriages attached to frame members holding the wiped member so as to face each other across the wiped member and moving back and forth over the frame members along two facing sides of the wiped member, a pair of wiper arms respectively attached to the pair of carriages and extending from the frame member sides to the wiped member sides, and a pair of wiper blades respectively attached to the pair of wiper arms, extending substantially parallel to the other two facing sides of the wiped member, and arranged at the surface of the wiped member.

The invention claimed is: 
     
       1. A wiper system for wiping off deposits deposited on a surface of a wiped member,
 the wiper system comprising:
 a pair of carriages attached to frame members holding the wiped member so as to face each other across the wiped member and moving back and forth over the frame members along two left and right facing sides of the wiped member; 
 a pair of wiper arms respectively attached to the pair of carriages and extending from the frame member sides to the wiped member sides; 
 a pair of wiper blades respectively attached to the pair of wiper arms, extending substantially parallel to the other two facing sides of the wiped member, and arranged at the surface of the wiped member; and 
 an arm drive mechanism making the pair of wiper arms move in a direction away from the wiped member when the carriages move down to the lower side of the wiped member and making the pair of wiper arms which were made to move away from the wiped member move to the wiped member side when the carriages move up to the upper side of the wiped member, 
 
 wherein the arm drive mechanism comprises:
 separation guide rails provided at the frame members at a lower side from the wiped member and mechanically guiding the pair of wiper arms in a direction away from the wiped member when the carriages have moved to the lower side of the wiped member, 
 contact guide rails provided at the frame members at an upper side from the wiped member and mechanically pulling the pair of wiper arms which were made to move in a direction away from the wiped member to the wiped member side when the carriages have moved to the upper side of the wiped member, and 
 variable arm angle mechanisms provided at the carriages for making the wiper arms rock about fastening shafts, provided for attaching end parts of the wiper arms at long direction frame member sides to the carriages, as centers of rotation within a predetermined angular range. 
 
 
     
     
       2. The wiper system according to  claim 1 , wherein
 the wiped member is shaped so that distances between the two facing left and right sides differ along a vertical direction of the wiped member, 
 the pair of wiper blades are arranged at the surface of the wiped member with one wiper blade offset from the other wiper blade in the vertical direction of the wiped member by exactly a predetermined distance, and 
 a total length of respective lengths of the pair of wiper blades added together is made a length of the wiped member or more at a location where the distance between the two facing left and right sides becomes longest. 
 
     
     
       3. The wiper system according to  claim 1 , wherein
 the wiped member is a front window of a vehicle, 
 the frame members are front pillars of the vehicle, and 
 a wiper blade at a driver's seat side of the vehicle among the pair of wiper blades is arranged at a surface of the front window offset by exactly a predetermined distance to a lower side in a vertical direction of the front window from a wiper blade of a navigator's seat side of the vehicle. 
 
     
     
       4. A wiper system for wiping off deposits deposited on a surface of a wiped member,
 the wiper system comprising:
 a pair of carriages attached to frame members holding the wiped member so as to face each other across the wiped member and moving back and forth over the frame members along two left and right facing sides of the wiped member; 
 a pair of wiper arms respectively attached to the pair of carriages and extending from the frame member sides to the wiped member sides; 
 a pair of wiper blades respectively attached to the pair of wiper arms, extending substantially parallel to the other two facing sides of the wiped member, and arranged at the surface of the wiped member; and 
 an arm drive mechanism making the pair of wiper arms move in a direction away from the wiped member when the carriages move down to the lower side of the wiped member and making the pair of wiper arms which were made to move away from the wiped member move to the wiped member side when the carriages move up to the upper side of the wiped member, 
 
 wherein the arm drive mechanism is configured to be able to switch between
 a state making the pair of wiper arms move in a direction away from the wiped member when the carriages have moved to the lower side of the wiped member and making the pair of wiper arms which had been made to separate from the wiped member move to the wiped member side when the carriages have moved to the upper side of the wiped member, and 
 a state making the pair of wiper arms move in a direction away from the wiped member when the carriages have moved to the upper side of the wiped member and making the pair of wiper arms which had been made to separate from the wiped member move to the wiped member side when the carriages have moved to the lower side of the wiped member. 
 
 
     
     
       5. The wiper system according to  claim 4 , wherein
 the arm drive mechanism is provided with variable arm angle mechanisms provided at the carriages for making the wiper arms rock about fastening shafts, provided for attaching end parts of the wiper arms at long direction frame member sides to the carriages, as centers of rotation by electromagnetic force within a predetermined angular range.